Mold for casting elements of printing-forms.



A. L. KNIGHT. v MOLD FOR CASTING ELEMENTS 0F PRINTING FORMS.

APPLICATION FILED SI-LPT. 18, I916 INVEN TO R. Amos L, KNIGHT.

cairn AMOS L, KNIGHT, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO LANSTON MONO- IYPE MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION or VIRGINIA.

MOLD FOB CASTING ELEMENTS OF PRINTING-FORMS.

Specification of Letters Patent.

Patented Feb. 19, 1-918.

Original application filed. October 3, 1914, Serial No. 864,894. Divided and this application filed September specification, and to the figures and letters of reference marked thereon.

This application isa division of my prior application Serial No. 864,894, filed October 3, 1914, now Patent No. 1,222,415.

The apparatus of said above mentioned application is primarily designed for the casting of printers rules,leads, etc. Generally speaking, the apparatus embodies a mold'open at one slde for the exit of the congealed metal, with means whereby the metal as it is congealed may be fed forwardly a distance which will leave behind it a mold cavity into which the molten metal to form the succeeding increment is injected, and

theseoperations are repeated indefinitely so long as the formation of the strip is continued. For feeding the congealed metal forwardly there is provided a reciprocatory mold blade which advances at the time when the metal congeals so as to push the strip forwardly and retreats to leave a mold cavity for the reception of the molten metal which is to form the succeeding increment. In cases where the height of the strip is less than type high the operative end of the-mold bladeis of reduced height and the mold cavity is correspondingly reduced in height by the insertion of a filler blade beneath which the forward end of the mold blade reciproblade embodying thepresent improvements.

Serial N0."120,821.

Fig. 2 is a perspective view of the gate pusher'which is operated by the mold blade.

Fig. 3 is an elevation of a filler blade for use in connection with the mold blade shown in Fig. 1.

Fig. 4c is an elevation of the support for the filler blade.

Fig. 5 is a sectional view in a plane longitudinally of the mold substantially on the line-5-5 of Fig. 6 showing the mold blade and gate pusher in elevation.

Fig. 6 is asection in a plane at rightangles to the-plane of the section in Fig. 5, substantially on the line 66 of Fig. 5.

Like reference characters in the several figures indicate the same parts.

Inasmuch as apparatus substantially corresponding to that of my said prior application has gone-into extensive public use and is well understood in the art, it has been thought unnecessary to illustrate herein the cperatingmechanism for the mold blade and ihemeans whereby the molten metal is injected into the mold cavity nor is it necessary, for an understanding of the present improvements, to illustrate in detail the means for severing the gate from the side of the strip and for severing the strip itselfinto'sections of'the desired length, especially as the operating mechanism, and the metal melting and injecting mechanism substantially corresponds to mechanism found in the type casting machines manufactured by the Lanston Monotype Machine Company, which have been in extensive public use for many years.

Referring to the accompanying drawings,

Figs. 5 and 6 embodies a mold base 3 which is formed with a channel therethrough in the direction of the movement of the mold blade, thus providing front and rear upwardly extending portions at which are adapted to be connected across the top of the mold by a tie bar or bars 5. Confined within the channel extending through the mold base are the type or side blocks between which the cavity for the reception of the molten metal is formed, and these type or side lolocks are preferably in the form of bars which extendbeyondthe mold cavity in each direction and are adapted to be separated a it will be seen that the mold illustrated iiidistance which will determine the width of the mold cavity and consequently the point size of the element being cast. The rear type or side block 8 (Fig. 6) is preferably formed with a smooth inner face and constitutes one wall of the mold cavity as well as the wall of the passage in which the mold blade works and of the exit opening in which the congealed metal is retained during the injection of molten metal to form a succeeding increment of the strip. The front type block may be of similar construction and arranged to be placed in opposition to the block 8 but it is preferably formed in two sections, 9 and 10, for convenience of manufacture, inasmuch as it has been found desirable to provide at one side of the mold cavity a channel and exit opening through which air and a portion of the molten metal from the mold cavity may escape in the form ofa more or less spongy mass, which, for convenience, may be called a gate lying at one side of the element and adapted to be severed therefrom.

By .reference to Fig. 6 it will be seen that between the two sections 9 and 10 there is formed a narrow space which widens out within the type block in the form of a channel which is conveniently of dove-tail or triangular cross section, as indicated at 12. The channel 12 and the narrow entrance slot 11 which communicates with the mold cavity, are preferably slightly tapered or of increasing cross section toward the exit end of the block so as to prevent binding during the movement of the gate toward the exit of the channel.

. Where the front type block is made in two sections, as just described, the upper section 9 is preferably made rigid with the lower section 10 by being fixed accurately thereto and supported by an upwardly extending portion 10 of the section 10, to which it is connected by screws or other suitable fastenings, as shown clearly in Fig. 6.

The two type blocks forming between them the mold cavity and mold blade channel are positioned laterally of the mold base by a packing plate 17 placed back of the rear type block and by the pressure screw 18 passing through the front projection 4 of the mold base and adapted to operate against the front type block. This pressure screw, in the preferred construction, is operated periodically in time with the feeding of the element being cast so as to clamp the sides of the mold cavity together during the casting operation and to release such pressure during the feed of the element forwardly in the mold cavity.

The bottom of the mold cavity is formed by the mold base and is provided with a nozzle opening 20 (Fig. 5) through which the molten metal is injected into the mold cavity through a nozzle 20 preferably ariazsaso'i ranged to direct the incoming metal against and along the rear face of the previously congealed increment of the strip so as to facilitate the fusion of the meeting edges of the two increments.

In the specific embodiment of the invention. illustrated herein the mold is adapted for the making of printers leads which are of less height than the full height of the.

blade support 59. The latter is clamped in position by a clamp 25 such as is ordinarily employed for clamping a matrix in position over the mold cavity.

The mold blade 2-7 which is mounted to reciprocate between the side blocks has plane side faces for contact with the faces of the mold cavity and is preferably of a thickness which corresponds to the point size of the strip'being cast and it is of substantially the same thickness as the tiller blade 57. It is guided by the side blocks and by guide extensions 31, 32, the forward limit of its movement being determined by the stop 33 preferably passing into an opening in the rear portion of the blade. In the st ructure illustrated'the forward portion of the blade is of reduced height or formed with a cutaway portion at 56 which works in beneath the filler blade and it will be understood that with a mold blade and filler blade of the construction described the height of the mold cavity may be accurately fixed by grinding away more or less of the under side of the filler blade over the mold cavity. In practice filler blades of different width above the mold cavity may be provided for producing leads of difierent height, it being understood that the filler blades are readily interchangeable in the construction shown.

The mold blade itself is provided with means whereby its operating member 35 may be readily attached thereto, such means conveniently and preferably consisting of a centrally located circular bearing into which a journal stud 36 on the end of the link 35 is adapted to work; Immediately. forward of this circular bearing the mold blade is;

formed with an aperturepreferably rectangular for the reception of .a lateral projection 29 of similar shape formed on the rear end of the gate pusher 28. The projection as may be required by its guide channel 12; the parts are preferably rectangular so that in any position a large bearing surface is provided. iVith this construction the mold blade is of exceedingly simple design and one may be readily substituted for another, the same means for connecting the operating member or link 35 and gate pusher 28 being provided in all blades.

In operation the mold blade reciprocates between the side or type blocks from a point just in front of the nozzle opening to a point in rear thereof which will determine the width of each increment of the casting and the gate pusher reciprocates in unison therewith in the gate channel 12, as shown clearly in Fig. 6.

The forward end of the mold blade is preferably inclined rearwardly at the top thereby giving a corresponding formation to the rear edge of the casting, with the result that the incoming molten metal is caused to impinge against and flow along said edge thereby insuring a fusing of the two increments at their meeting edges.

What is claimed is 1. A mold blade for machines for casting printers leads and rules having its front edge shaped to form one wall of the mold cavity and having means in rear of said front edge for cooperation with a driving connection and also having means for the direct attachment of a gate pusher whereby the blade will be reciprocated by the driving connection and the gate pusher will be moved by and in unison with the blade.

A mold blade for machines for casting printers leads and rules having its front edge shaped to form one wall of the mold cavity and having in rear of said edge two apertures, one a circular aperture for the journal connection of the driving mechanism and the other a rectangular aperture for the reception of a rectangular projection on a gate pusher whereby the blade and pusher will be moved in unison.

3. A thin, flat mold blade for printers lead and rule casting machines having plane side faces for contact with the faces of the mold cavity and having its forward edge shaped to form one wall of the mold cavity the face of said edge having its upper por tion extended rearwardly of the lower portion whereby a mold cavity of irregular contour will be formed to facilitate the union of successive castings.

t. A mold for printers lead and rule casting machines, embodying the following instrumentalities, to-wit: side blocks between which the mold cavity is formed, a mold blade mounted to reciprocate between said blocks-and forn'iing one wall of the cavity, and a thin, flat filler blade of uniform thickness mounted in fixed position between the blocks above the mold blade and forming an edge wall of said cavlty.

5. A mold for printers lead and rule casting machines embodying side blocks between which the mold cavity is formed, a reciprocatory mold blade between and of less width than the height of the blocks, and a fixed blade of substantially uniform thickness throughout, projecting between the blocks over the mold blade and forming one wall of the cavity.

6. A mold for printers lead and rule casting machines embodying side blocks be tween which the mold cavity is formed, a reciprocatory mold blade between the blocks and a fixed blade between the blocks and forming one wall of the cavity, said mold blade and fixed blade being of substantially uniform and equal thickness.

7. A thin, fiat filler blade for reducing the height of the cavity in a lead and rule casting mold, embodying a body portion corresponding in thickness to the point size of the mold cavity having one edge face shaped to form a wall of the mold cavity and overhanging extensions on the edge of the body opposite said face for cooperation with the blade supporting means.

AMOS L. KNIGHT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

